[Enhancement] Delete media after "x" days (#160)

* [Enhancement] Adds ability to stop media from re-downloading (#159)

* Added column

* Added methods for ignoring media items from future download

* Added new deletion options to controller and UI

* Added controller actions and UI for editing a media item

* Added column to sources

* Added retention period to form

* [WIP] getting retention methods in place

* Hooked up retention worker

* Added column and UI to prevent automatic deletion

* Docs

* Removed unused backfill worker

* Added edit links to media item tabs on source view

* Clarified form wording

* Form wording (again)

lib/pinchflat/media/media_query.ex

@@ -17,6 +17,7 @@ defmodule Pinchflat.Media.MediaQuery do
 
   # Prefixes:
   # - for_* - belonging to a certain record
+  # - join_* - for joining on a certain record
   # - with_* - for filtering based on full, concrete attributes
   # - matching_* - for filtering based on partial attributes (e.g. LIKE, regex, full-text search)
   #
@@ -31,6 +32,27 @@ defmodule Pinchflat.Media.MediaQuery do
     where(query, [mi], mi.source_id == ^source.id)
   end
 
+  def join_sources(query) do
+    from(mi in query, join: s in assoc(mi, :source), as: :sources)
+  end
+
+  def with_passed_retention_period(query) do
+    where(
+      query,
+      [mi, sources],
+      fragment(
+        "IFNULL(?, 0) > 0 AND DATETIME('now', '-' || ? || ' day') > ?",
+        sources.retention_period_days,
+        sources.retention_period_days,
+        mi.media_downloaded_at
+      )
+    )
+  end
+
+  def with_no_culling_prevention(query) do
+    where(query, [mi], mi.prevent_culling == false)
+  end
+
   def with_id(query, id) do
     where(query, [mi], mi.id == ^id)
   end
@@ -53,6 +75,10 @@ defmodule Pinchflat.Media.MediaQuery do
     where(query, [mi], mi.upload_date >= ^date)
   end
 
+  def with_no_prevented_download(query) do
+    where(query, [mi], mi.prevent_download == false)
+  end
+
   def matching_title_regex(query, nil), do: query
 
   def matching_title_regex(query, regex) do